jordan
your tank is nice and clear,
typical koi lol(oh yeah you wont be able to have gravel in your pond plants pots big pebbles only or you will be forever picking up off the bottom and catc hing floating plants :

)
keep a close eye on the koi as they grow they will eventually bully the fancies, they will fin nip the fancies as they are slower and cant get out of the way of the koi, the koi will also chase the fancies till they become so stressed,ill or die (i speak from experience,jelly my pure white fancy goldie had a beautifull set of fins came down one morning can the koi where shredding him to bits,i just glad i had the pond to put the koi into)
keep a close eye on the tanks water perameters koi play havoc with water in a tank with them being a dirty fish (they creat a lot of waste)
have a look here this will let you about the ph for koi
http://www.koiponduk.org/smf/index.php?topic=1157.0redcap like ph 6.5-7.5
black moor like ph 6.0-8.0